From SBS Vol. 7 – Chapter 55:
“Dokusha (reader):
“Why does Sanji-san’s eyebrow curl up at the end? Please give a real answer!!”
Oda: “Hey!! You, sit right there!! Now listen!! Everyone lives in circles!! The sun, the moon, and the earth all spin around!! And!! If the earth suddenly stopped spinning!! It would be a disaster, tidal waves everywhere!! Now remember that Sanji’s eyebrow channels that circular energy!! Reflect upon this!! You may go!!”
When contemplating the reason Oda would choose to have Sanji’s eyebrows swirl clockwise (instead of the common trend of counter-clockwise curling brows with his siblings), I suddenly remembered a fact that seems to connect all of the clues mentioned so far. Most planets in our solar system have a counter-clockwise rotation, but one key planet has a unique clockwise (retrograde) rotation: Venus!
Venus is a virtual Hell. It is the hottest planet in our solar system, even though it isn’t even the closest to the sun. Venus is so hot, even lead metal will melt on its surface. Furthermore, a thick smoke-like atmosphere surrounds the planet. Lastly, Venus is named for the ancient Greek mythological goddess of love. This is a perfect trifecta for our fire-producing, cigarette-smoking, love-cook!
How much is Sanji’s bounty right now?
In summary:
1.Oda referenced Sanji’s power being related to cosmic forces.
2.Sanji is the only Vinsmoke with both eyebrows curling counter-clockwise, like the rotation of the planet Venus with which he shares several key characteristics.
3.The Vinsmokes each relate to one of the major fields of science.
4.Judge Vinsmoke may have modified his children using advancements learned while working with Vegapunk (and team).
5.Although Judge thinks he failed to infuse Sanji with cosmic powers via the lineage factor, he may have unwittingly tapped the power of the ancient weapon Uranus.